private function getMenuNodes()
 {
     $navigationModel = new NavigationModel();
     $localNavigation = $navigationModel->getLocalNavigationTree(NavigationModel::WIKI_LOCAL_MESSAGE);
     $onTheWikiNavigation = $navigationModel->getOnTheWikiNavigationTree(NavigationModel::WIKIA_GLOBAL_VARIABLE);
     return array_merge($localNavigation, $onTheWikiNavigation);
 }